Abnormal temperature alarm



Feb- 2 H. IQBERREICH ABNORMAL TEMPERATURE ALARM Filed April 4. 1925INVENTOR. lows/9f fiaenvz/ng .7 ,jrfiRNEY. I

Patented Feb. 15, 1927.

4 "warren s rar ng;

LO IE- QB B B EIQH NDlAN BQL ND AJ-\ A- ABNORMAL T Mr ee Applicationfiied -Apr il' 4, 1925i Serial No; 2056735 applied otherwise than intemperature alarms. "A further object ofimy: invent-ionvis' to providesuch adevice havinga :coil-spring motorwith asignal which "will" giveEtVlSlblG indication when the spring requires rewind I accomplish theaboveobjects-by provide ing abell with a tapper= actuated by clock workmechanism, and I provide this clock work mechanism with athermostatically controlled'stop wh ich when' once disengaged to permitthe -operatiom of the" clockwork mechanism will remain out of engagementuntil reset by the thermostatat a lower term peratnre thanthatnecessaryto cause dis engagement. Toprovidemeans "for indicat ingthat the coil-spring ofthe oloclm or-k mechanism requires rewindingI-inclnde in my devicea pivotedflever provided Wltll anar-m=bearing'against"acoil of the springgi so thatithe A position of'this-- arm wilh vary with I the posit-ion" of the spring-turn with;which itis 'in engagement andhwilli give ag; visible indication of"the-'con'dition of thecspringz The accompanying dr-awing illustrates m=yinventiOnz-Fi'g. 1 is a front:elevationtof my device with sameof theparts: broken away :to more I clearly-show their construction Fig: 2 Iis a vertical section throng-hi the casing; and hell showing the partsvofithe clockworkmechanism-g Figs- 3 and lyarerdes tail views on: an:enlarged isca-le showing; the construction of the release mechanisrnuandits associated-parts; and Fig. 5"-is fragmenta'l plan VlQW- showing themeans; provided for adjusting therth'ermostatic element tov-ary thetemperature at which the alarm will-:operate:

a device: includes aesuppo-rting member v to which isiaflixed-"i a;circuilan'icasing 11 fromwhich is supported springecasin'ge 12 provided?a-cover l 3z A'coilsprin'g 14s is mounted- Within the spring-casing 1-25the outer end ofsuch spring being fastenedjto the sprlng-casinjgj 12andi-ltlie; inner endto a shaft 15: wh-ic'h-extends-into the casing-l'li Ai-bfilh16-lS-SBCUPGCl DO the outer end oi -the shaft 15' by a nut1-7, the K on ter e'nd' oi the shaft 15 vpreterablybeing provided with asquaredhportionwhich enters square 1 hole ln th'e' bell r Rotatablymounted on -the shaft -15 with a r paw-l 21 arranged to engage the teethof: a ratchet 22:: which is rigidly-mounted on the shaft 15 by'mean's ofmint- 23; 'Dheggear QO meshes-x-with a small pinion -24 rigi'dly attaehed toa gear 25:"whidnimturn meshes with the escapement' pinion 26sRotatahle v with -the-pin-ion 26i is the: escape wheel 27 provided:-with atvperipheral 1 series offiteeoh which' engagei the teeth" 28+land2'8-- of the pivotal/11y: mounted: hellsatapper. 29? J A's-theescapeewheeli 27' rotates; itoseiliates:theebelltapper'i29 'to ring thehell. :"Rotation of the escape wheebi Q'K g-is normallytpreventedsby apin :305mounted*on =suchescape wheel':impo; sitiom tow cor-opeiateswitlrr mya-imprcved re- 1ease.-zmechanism.=- 1 V is Thisirelease'mechanism isgshownvin detail in" Eigse 3 4? 1'. Itcomprises,eaibasecphate 31% mounted .onthencasin'g 1 1 by nreansvofscrews. 32; .whi-chzbases platerserves to su pp'o-rt azpair "of levers133: and 34 \vhicli' forn1 a 'tog gl'e. a The lever:34ispivotedtoathelbase; plate 31: by a? pin': 85:-ancl-: is: pivotally coI1nect-edt'ofithe leveix-33 by a? pin .36.1 Therlever 3* is provi'dedawith; a'slot 37 fori therreeeption of apinr38 aon the base :plate31.."Ii1e-1eve' carries a; stop 4:0 which normallylies: in the path ofthe+pi1t 3O and which when J eng'aged the pin; 30 1 as: shown in iEwprerents rotationuofy thesescapeiwheel 27. I

Y A thermostatic element; seems a lei-metal; lic' strip) 41 is connectedby;- aylin k 4.142 with the lever 34c; ,thealink 4C2 beingq; provided;with I a slot: 43 which a; engages apinearmountedaon tvl1erleerv343 jTon-adjust the'.;1toggle formed rotation of the escape wheel 27.Preferably,

30 upon the slightest movement of the pin 36 to the left and downwardfrom the position shown in Fig. 3. The spring 47 exerts but slightpressure on the lever 34 so that with the toggle set in the positionshown in Fig. 3 the pressure exerted by the spring 47 is insufiicient toopen the toggle against the friction between the pin 30 and the stop 40.y w

As shown in Fig. 3, the parts are in the position occupied when thealarm is sub jected to a relatively low temperature. As the temperatureincreases the lower end of the thermostatic element 41 moves to theright from thedotted line position indicated in Fig. 4; and when thismovement becomes sufficient, the'end of the slot 43 engages the pin 44and moves the lower end of the lever 34 to the right. This operationmoves the pin36 to the left and downward, disengages the stop from thepin 30, and permits rotation of the escape wheel 27 and the consequentsounding of the alarm. The spring 47 assists in opening the toggle, and,after 'it is once opened, this spring serves to hold it openuntil it isdefinitely re-set by the thermostatic elements moving'the lever' 42 tothe left to the position shown in Fig. 3. Thus, the alarm will continueto ring until the thermostatic element has cooled to a temperatureconsiderably below that neces sary to release the stop 40 from the pin30.

Pivotally mounted on the back of the spring casing 12 is the signal .forindicating when the spring'14 is run down. Thissignal comprises-an arm50 pivotally supported nearone end as by a screw 51. At the oppositeend, the arm 50 has a laterally ex tending portion 52 which amay.project through a slot 53' in the side ofthe casing 11 when the arm 51is moved to the right. Rigid with the arm 50 is a finger 54 whichprojects through a slot 55 in the base o'fthespring casing 12 and bearsagainst one of the turnspr'eferably the outer turn -ofthe coil spring14, the finger 54 being held in engagement with the spring-turn by meansof a spring 56. As the spring runs down, its coils expand, and the outercoil forces the arm 50 to the right (Fig. 1), the arm 50 being soarranged-that the enlarged portion 52 becomes visible beyond the side ofthe bell 16 before the spring 14 has reached the limit of its expansion.The enlarged portion 52, therefore, serves as a visible signal giving anindication when the'spring 14 requires rewinding.

Desirably, some 'means is provided for adjusting the temperature atwhich there lease mechanism is actuated to set the alarm in operation.Such an adjustment may be obtained by the screw which passes through thethermostatic element 41 and into the casing 11. vided with a graduatedhead 61 to indicate the temperature at which the alarm will be set inoperation. By virtue of the slot 43 in the link 42, adjustment of thescrew 60 to lower the temperature at which the alarm will be set inoperation does not actuate the release mechanism,

With the thermostat 41 adjusted as de sired by the screw 60, the alarmmay be placed in the desired location. As the'tem perature rises, thelower end of the thermostatic element 41 moves to the right carrying thelink 42 with it. NVhen a temperature is reached corresponding to thesetting or-v the screw 60, the end of the slot 43 will en-. gage the pin44 and move the lower end of the lever 34 to the right. As abovedescribed, this movement will disengage the stop 40 from the pin 30andpermitopera- 'tion of the alarm, the spring 47 serving to This screw60 may be prohold the stop 40 out of engagement with the I pin80 untilthe release mechanism is reset by movement of the thermostatic element41 to the left. This resetting of the release mechanism does not occuruntil the thermostatic element 41 has cooled to a temperatureconsiderably lower than that necessary to actuate the release mechanism.Thus, the alarm is not affected by small fluctuations in temperature. 7As the alarm operates, the spring 13 unwinds and forces the arm 50outward until the enlarged portion 52 comes into View. beyond the rimofthe bell 12, The appearance of the arm-enlargement 52 is an indicationthat the spring should be r'ewound, and this rewinding may be easilyaccomplished byrotation of the bell 12-.

I claimv 1; In combination with a temperature alarm, a re-settablerelease mechanism effective when actuated to initiate the operation ofsaid alarm and when re-set to stop said operation, and atemperature-respoir sivei device for actuating said release mechanism ata predetermined temperature and for re-setting said release mechanismonly at a lower temperature.

2. The combination set-forth in claim 1,

with the addition-of means tending to prevent the re-setting of saidrelease mechanism until said release mechanism is definitely re-set bysaid temperature-responsive device.

3. In combination with a temperature alarm, are-settablereleasemechanism effective when actuated to initiate the operation of saidalarm and when-re-set to stop said operation, a temperature-responsivedevice for actuating. said release mechanism at a predeterminedtemperature, and means for preventing the re-setting of said releasemechanism except at a different temperature from that necessary to causeits actuation.

4. In combination with a a temperature alarm, a re-settable releasemechanism effective when actuated to initiate the operation of saidalarm and when re-set to stop said operation, a temperature-responsivedevice for actuating and resetting saidrelease mechanism and alost-motion connection between said temperature-responsive device andsaid releasemechanism. 1

5. Thecombination set forth in claim 4:, with the addition of meanstending to prevent the re-setting ofi said release mechanism until saidrelease mechanism is definitely re-set by said temperature-responsivedevice. I

6. A release mechanism for alarms, comprising a base, a pair of leverspivotally connected together and pivotally supported from said base, anabutment on one of said levers adapted to engage a moving part of saidalarm to prevent operation of said alarm when said two levers arearranged one of said levers adapted to engage the other of said leversto limit relative rotation of said levers in one direction about theiraxis of pivotal connection.

8. In a temperature alarm, mechanism, a temperature-responsive devicefor actuating and resetting said release mechanism, a lost-motionconnection bea release tween said temperature-responsive device and saidrelease mechanism, and means for adjusting said temperature responsivedevice to vary the temperature at which said release mechanism will beactuated.

In witness whereof, I have hereunto set my hand at Indianapolis,Indiana, this 1st day of April, A. D. one thousand nine hundred andtwenty five.

, LOUIE I-I. OBERREICH,

